@bluechameleon: Thank you again. This is a place I used to go thru quite often... and often in a rush. But you know, it's places you always go you don't photograph (at least me). But it got in my head somehow : this looong tunnel (leading to the subway) making me dizzy would make a perfect subjet for a "long" exposure, handheld. Half a second is not that long, but it recreated perfectly what I feel in this place.